Tool for grinding internal cylindrical surfaces



J. R. HOBBS. TOOL FOR GRINDING INTERNAL CYLINDRICAL SURFACES."1,393,625.

APPLICATION FILED 111N515 I920:

Patented Oct. 11, 1.921.

Fla. 7.

FIGS

I I i I? ii I? H I i I r.. v

' Latches.

UNITED STATES PATENT OFFICE.

JOHN nonnnr noses, or LONDON, ENGLAND.

I Specification of Letters Patent.

Patented Oct. 11, 1921.

Application filed June 15, 1920. Serial N0.889,192.

To all whom it may cmwem:

Kensal Rise, London,

.Be it known that 1,-J0HN ROBERT Hours, a; British subject, residin at21 Buller road,

ngland, have invented certain .new and useful 1m rove- Inents in-To'ols=for Grinding. Internal ylindrlcahsunfaces, of which the following is aspecification.

lfiflhisxinvention relates to a new or improved tool primarily intendedfor grinding thecyl-inders of'internal combustion engines either for thepurpose of removing scores or ridges, or in connection .with the fittingoi over-size pistons.

The invention is, how even-applicable generally-for grinding internalcylindrical surfaces.

Theinvent'ion is illustrated in the accompanying drawing. in whichFigure 1 shows an underside view of Fig 1, Fig. 3 is an elevation of thecage, Fig. 4. is an elevation of the cutting-stone, Fig. 5 is a plan ofthe cage,:Fig. 6 is a plan of the cutting stone,

-' .Fi-g; 7 is a plan and Fig. 8 is an edge view of the retainingwasher.

According to' the preferred form of the invention, the improved toolcomprises a central body 1 of solid material, generally cylindricalin-shape, but provided with two or more dove-tailedslots 2 of whichthree are shown in dottedlines in Fig. 2, the slots being arrangedaxially the whole length of the cylinder. The body is centrally boredand the lower face is provided with an integral circular flange 3, Fig.2.

The dove-tailed slots are adapted to house correspondingly formed cages,i, Figs. 3 and 5, each adapted to receive a. carborundum or similarcutting stone 5, Figs. 4 and 6, the stones being urged outwardly bysprings 6 partly housed in sockets 7 in the ca es.

The walls 8 of the cages are provi ed with slots 9 forming inturnedflanges 10 adapted to engage with flanges 11 formed on the stones; bothflanges extend to the upper end of thecages but are interrupted close tothe lower end to form a stop for the retention of the stones. The cagesare shouldered at the lower end as shown in order to receive a washer12, Figs. 7 and 8 which registers with and is attached to the lower endof the body by screws and forms an abutment for the cages. The body ismounted on a central spindle 13, of which the head 14 is shown in Fig. 2seated within the flange 3, and is locked thereon by means of a wingnut15 and washer 16.

It is apparent from the construction above described that the grindingstones cxtend'the full length of the body and that thereby the grindingaction may readily reach the extreme end of the cylinder, andfurthermore the cooperation of the cages and body is such as to permitthe association with the body of cages of diiierent sizes, as ma benecessary in use with cylinders of di ferent bores.

In use the tool may be operated either by a hand brace or drill, or setup in a lathe or drilling machine. One convenient mode of'operationconsists in mounting it in a pillar drilling-machine the cylinder beingbolted to a stand:

It is intended to provide with each tool cages of varying sizes to suitcylinders of varying dlameters putside the limits to which the rangeof'adjustment provided by the springs 6 in the form shown isaccommodated.

I claim 1. A tool for grinding internal cylindrical surfaces, comprisinga body, cages held in ways formed in the body, ber secured to the lowerend of the body, the cages being recessed to receive the abutmentmember, and a grinding stone slidably held in each ca e and normallyprojected toward the artic e being ground.

2. A tool for grinding internal cylindrical surfaces, comprising a body,cages held in ways formed in the body, an abutment member secured to thelower end of the body, the cagesbeing recessed to receive the abutmentmember, a grinding stone for each cage having projections, the cageshaving flanges to cooperate with said projections to limit movement ofthe stones in one direction, and springs bearing between cages andstones to project the stones toward the article being ground.

3. A tool for grinding internal cylindrical surfaces, comprising a body,cages held in ways formed 1n the body, an abutment member secured to thelower end of the body, the cages being recessed to receive the abutmentmember, and a grinding stone slidably held in each cage and normallyprojected toward the article being ground. a spindle having a headhoused within an opening in, said. abutment member, and

an abutment memmeans carried by said spindle and body to secure thespindle in fixed relation to the body.

4. A tool for grinding internal cylindrical surfaces comprising a bodyformed with dove-tailed ways extending t roughout the length thereof,cages arranged for cooperation with thebody and each comprising aprojection to fit within a dove-tailed way in the body, walls extendingfrom the project-ion to provide a receiving member, and a grinding stonearranged in the receiving member and adapted for movement radially ofthe body.

5. A tool for grinding internal cylindrical surfaces comprising a body,cages held in ways formed in the body, an abutment member secured to thelower end of the body, the cages being recessed to receive said memberand beyond the recess extending to the extreme lower end of the tool,and a grinding stone removably supported in each cage,

id stone being of the full length of the the sa cage.

6. A tool for grinding internal cylindrical surfaces, comprising a bodyformed with vertically extending dove-tailed ways, cages having parts tocooperate with said ways a and hollow extensions from said parts, theparts making the ways being of less length than the hollow extensions toprovide recesses at the rear of the cages, an abutment secured upon thelower end of the body and fitting in said recesses to hold the cages inplace at the lower end, removable means to secure the cages withrelation to the body at the upper end, and a grinding stone mounted ineach hollow extension of each cage and movable radially with respect tothe body.

7. A tool for grinding internal cylindrical surfaces, comprising a bodyformed with vertically extending dove-tailed Ways, cages having parts tocooperate with said we s.

than the ho low extensions to provide rec'esses at the rear of thecages, an abutment securedupon the lower end of the body and littm-g11153111 recesses to hold the cages in place at the lower end, removablemeans to secure the cages with relation to the body at the upper end,and a grinding stone mounted m each hollow extension of each cage andmovable radially with respect to the body, saldgrinding stones being ofthe full length of the hollow extensions of the cages and equaling thefull length oi the body and abutment. t

v 8. A tool for grinding internal cylindrical surfaces; comprising abody formed with vertically extending dove-tailed ways, cages havlngparts to cooperate withsaid ways and hollow extensions-from said parts,the

parts making the ways being of; less length than the hollow extensionsto provide recesses at the rear of the cages, an abutment secured uponthe lower end of the body-and fitting in said "recesses to hold thecages in place. at the lower end, removable means to secure the cageswith relation to the body at the upper end, and agrinding stone mountedin each hollow extension of each cage andmovahle nadiallywith respect tothe body, the hollow extension of each 0 being formed with recessesclosed at- E: outer ends, and the grinding stones-having ribs toslidably seat in said recesses, andsprings to normally project thegrinding stones to the limits of said recesses:

In testimony whereof-I afiix my si atnre.

, JOHN ROBERT HO BS.

